Inateck Online via Amazon offers the Inateck 13.3" Envelope Sleeve for MacBook Air / Pro in Grey for $16.99. Coupon code "Q53V9CNT" cuts it to $10.99. Plus, Prime members receive free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $8.28.) That's $26 off and the lowest total price we could find. Designed specifically for MacBook Air and Pro, it also fits most 11" laptops and features two back pockets, and a small felt bag for a power adapter or mouse. Deal ends May 10.